MC78M08BT

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The MC78M08BT is an 8-pin voltage regulator from ON Semiconductor. It is classified as a linear voltage regulator, which falls within the greater power management integrated circuits (PMIC) category. The regulator is designed primarily to provide a fixed output voltage of +5V, with continuous output current up to 1A.

The MC78M08BT can be used in a variety of applications. These include computers, laptops, and peripheral electronic devices such as keyboards, mice and external drives. It can also be used in home appliance control circuits, automotive applications and commercial systems.

The MC78M08BT is a three terminal, low drop-out voltage regulator that can be used for voltage adjustment, for instance to create a +5V rail from a +12V supply. It is capable of supplying up to 1A output current, and it includes fold-back current limit and over temperature protection.

The MC78M08BT operates in one of two modes. The first is the conventional regulation mode wherein the output voltage is maintained at a fixed value, regardless of the input voltage. The second is the adjustable voltage mode, wherein the output voltage can be adjusted over a wide range. In the adjustable voltage mode, the output voltage is controlled by an external feedback resistor. This enables the device to achieve a wide range of output voltages.

The MC78M08BT employs an internal PNP transistor to deliver the output current. When there is no output load, the device operates in a low-power standby mode, drawing minimal quiescent current. If a short circuit is present, the device switches to its shortened condition, in which the output transistor is switched off and the current is limited by the sense resistor.

When operating in the adjustable voltage mode, the MC78M08BT provides good regulation even under extreme load conditions. It also has an excellent line and load regulation, which means that the output voltage remains constant regardless of the changes in the input voltage and current or load conditions.

In conclusion, the MC78M08BT is a robust and reliable linear voltage regulator from ON Semiconductor. The device provides a fixed output voltage of +5V with a maximum continuous output current of 1A. It is suitable for a wide range of applications and has a good line and load regulation over a wide input voltage range. The adjustable voltage mode enables the device to achieve a wide range of output voltages and it also has a low quiescent current in the no-load condition.

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